7155955993 has 2 divisors, whose sum is σ = 7155955994. Its totient is φ = 7155955992.

The previous prime is 7155955973. The next prime is 7155956051. The reversal of 7155955993 is 3995595517.

It is an a-pointer prime, because the next prime (7155956051) can be obtained adding 7155955993 to its sum of digits (58).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4501336464 + 2654619529 = 67092^2 + 51523^2 .

It is an emirp because it is prime and its reverse (3995595517) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7155955993 is a prime.

It is not a weakly prime, because it can be changed into another prime (7155955973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3577977996 + 3577977997.

It is an arithmetic number, because the mean of its divisors is an integer number (3577977997).

Almost surely, 2^7155955993 is an apocalyptic number.

It is an amenable number.

7155955993 is a deficient number, since it is larger than the sum of its proper divisors (1).

7155955993 is an equidigital number, since it uses as much as digits as its factorization.

7155955993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9568125, while the sum is 58.

The square root of 7155955993 is about 84592.8838200945. The cubic root of 7155955993 is about 1927.0333037721.

The spelling of 7155955993 in words is "seven billion, one hundred fifty-five million, nine hundred fifty-five thousand, nine hundred ninety-three".